[cypher]

That's a difficult one really, you don't need to worry about cleaning poo too often but if there is a build up of damp pee & ammonia it won't be healthy to leave it, can you try to encourage your ham to pee somewhere a bit more accessible? Does she have a house? Often if you have a large enough house you can put a litter tray of some sort in there & they may use that or if the house has a lid you can just lift up you can access any peed on nest easier.
I would keep an eye on her burrows for now, check now & then to see what it's like. It is better to leave the nest etc alone as much as possible but you also do have to be sure there isn't pee building up so a bit of a balancing act really!